The strength of the West is confession. How can a people improve if they are not willing to admit to their mistakes and learn from their past?
In the Islamic world confession is regarded as a weakness. Progress is slow when you do not have the humility to admit you were wrong. (And it is even slower when you blame others for all your problems.)
Different religions (which have different values) lead to very different cultures and very different kinds of civilisations. If the West does not wake up soon, all will be lost (see Ayaan Hirsi Ali: The Growing Threat of Radical Islam).
There is no guarantee that western civilisation will survive.
So why did the West turn from the God of the Bible? There are many reasons. One of which is bad theology. The Church (without realising it) made God look like a monster. See "A Legacy of Fear and Persecution" in Thomas Talbott's book, The Inescapable Love of God. See also Is Hell Eternal? and What's Wrong with the Innocent Dying for the Guilty?